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Note 15 - Employee Benefit Plans (Detail) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Defined Contribution Plan, Employer Discretionary Contribution Amount | $ 570,000 | $ 573,000 | $ 430,000 |
Defined Benefit Plan, Other Costs |  | $ 466,000 | $ 299,000 | $ 37,000

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_DefinedBenefitPlanOtherCosts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration